U.S. patent number 7,553,804 [Application Number 11/646,050] was granted by the patent office on 2009-06-30 for aqueous liquid crystal display cleaning agent compounds and their fabrication methods.
This patent grant is currently assigned to BYD Company Limited. Invention is credited to Xuegang Chen, Junqing Dong, Qing Gong, Zhiql He, Dong Liu.
United States Patent |
7,553,804 |
Liu , et al. |
June 30, 2009 |
Aqueous liquid crystal display cleaning agent compounds and their
fabrication methods
Abstract
The present invention discloses aqueous LCD cleaning agent
compounds and their fabrication methods. Said cleaning agent
compounds comprise of double fatty acid polyethylene glycol ester,
fatty alcohol polyoxyethylene ether, polyethylene(3) glycol alkyl
ether tri(alkyl ethers)amine sulfate and/or polyethylene(3) glycol
enyl ether tri(alkyl ethers)amine sulfate, alkyl benzenesulfonic
acid, lecithins and water. In particular, the weight of the
ingredients in the compounds as a weight percentage of the weight
of the compounds is: double fatty acid polyethylene glycol ester
(10-50 wt %), fatty alcohol polyoxyethylene ether (5-60 wt %),
polyethylene(3) glycol alkyl ether tri(alkyl ethers)amine sulfate
and/or polyethylene(3) glycol enyl ether tri(alkyl ethers)amine
sulfate (5-20 wt %), alkyl benzenesulfonic acid (1-15 wt %),
lecithins (1-10 wt %), water (5-50 wt %). Embodiments of the
aqueous LCD cleaning agent compounds of the present invention can
effectively remove both the crystal liquid materials in the gaps
between the two glass substrates and foreign contaminate particles
attached on the surfaces of the glass substrates. Moreover, the LCD
cleaning agent compounds have the characteristics of low toxicity,
environmental friendliness, low flammability and high cleaning
capabilities for various crystal liquid materials.
Inventors: |
Liu; Dong (Shenzhen,
CN), Chen; Xuegang (Shenzhen, CN), Dong;
Junqing (Shenzhen, CN), Gong; Qing (Shenzhen,
CN), He; Zhiql (Shenzhen, CN) |
Assignee: |
BYD Company Limited (Shenzhen,
CN)
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Family
ID: |
38194658 |
Appl.
No.: |
11/646,050 |
Filed: |
December 26, 2006 |
Prior Publication Data
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Document
Identifier |
Publication Date |
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US 20070149433 A1 |
Jun 28, 2007 |
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Foreign Application Priority Data
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Dec 26, 2005 [CN] |
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2005 1 0132751 |
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Current U.S.
Class: |
510/243; 510/163;
510/180; 510/351; 510/352; 510/356; 510/357; 510/413; 510/414;
510/421; 510/422; 510/423; 510/425; 510/426; 510/427; 510/428;
510/431; 510/436 |
Current CPC
Class: |
C11D
1/835 (20130101); C11D 3/384 (20130101); C11D
11/0047 (20130101); C11D 1/62 (20130101); C11D
1/72 (20130101); C11D 1/74 (20130101) |
Current International
Class: |
C11D
1/83 (20060101); C11D 3/36 (20060101) |
Field of
Search: |
;510/163,180,243,351,352,356,357,413,414,421,423,422,425,426,427,428,431,436 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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01114910 |
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Oct 2001 |
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CN |
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03122204 |
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Oct 2003 |
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CN |
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Other References
ZhiQi Liang, Practical Manual cleaning technology, 2005, p. 376,
Chemical Industry Press, Beijing, China. cited by other .
Cheng Liu, WangFu Zhang, ChangMing Cheng, Surfactant Handbook,
1996, p. 63, Chemical Industry Press, Beijing, China. cited by
other.
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Primary Examiner: Boyer; Charles I
Attorney, Agent or Firm: Venture Pacific Law, PC
Claims
We claim:
1. An aqueous cleaning agent compound, comprising: double fatty
acid polyethylene glycol ester; fatty alcohol polyoxyethylene
ether; polyethylene(3) glycol alkyl ether tri(alkyl ethers)amine
sulfate and/or polyethylene(3) glycol alkenyl ether tri(alkyl
ethers)amine sulfate; alkyl benzenesulfonic acid; lecithins; and
water.
2. The cleaning agent compound of claim 1 wherein the weight of
said double fatty acid polyethylene glycol ester is between 10-50
wt % of the weight of said cleaning agent compound; the weight of
said fatty alcohol polyoxyethylene ether is between 5-60 wt % of
the weight of said cleaning agent compound; the weight of said
polyethylene(3) glycol alkyl ether tri(alkyl ethers)amine sulfate
and/or polyethylene(3) glycol alkenyl ether tri(alkyl ethers)amine
sulfate is between 5-20 wt % of the weight of said cleaning agent
compound; the weight of said alkyl benzenesulfonic acid is between
1-15 wt % of the weight of said cleaning agent compound; the weight
of said lecithins is between 1-10 wt % of the weight of said
cleaning agent compound; and the weight of said water is between
5-50 wt % of the weight of said cleaning agent compound.
3. The cleaning agent compound of claim 1 wherein the weight of
said double fatty acid polyethylene glycol ester is between 10-40
wt % of the weight of said cleaning agent compound; the weight of
said fatty alcohol polyoxyethylene ether is between 30-50 wt % of
the weight of said cleaning agent compound; the weight of said
polyethylene(3) glycol alkyl ether tri(alkyl ethers)amine sulfate
and/or polyethylene(3) glycol alkenyl ether tri(alkyl ethers)amine
sulfate is between 5-15 wt % of the weight of said cleaning agent
compound; the weight of said alkyl benzenesulfonic acid is between
5-15 wt % of the weight of said cleaning agent compound; the weight
of said lecithins is between 2-5 wt % of the weight of said
cleaning agent compound; and the weight of said water is between
10-20 wt % of the weight of said cleaning agent compound.
4. The cleaning agent compound of claim 1 wherein said double fatty
acid polyethylene glycol ester has the following formula:
R.sub.1COO--(CH.sub.2--CH.sub.2--O--CH.sub.2--CH.sub.2--O).sub.n--OC--R.s-
ub.2 wherein said R.sub.1, R.sub.2 are identical or different alkyl
or alkenyl having 3 to 15 carbon atoms and n is an integer from 3
to 15.
5. The cleaning agent compound of claim 4 wherein said R.sub.1 and
R.sub.2 are identical; said R.sub.1 and R.sub.2 is selected from
the group consisting of pentyl-, hexyl-, hepty-, octyl-, nonyl-,
decyl-, undecyl-, dodecane-, tridecyl-, pentenyl-, Hexenyl-,
heptenyl-, octenyl-, nonenyl-, decenyl-, undecenyl-,
dodecenyl-dodecenyl-; and n is an integer from 5 to 12.
6. The cleaning agent compound of claim 4 wherein said double fatty
acid polyethylene glycol ester is selected from the group
consisting of polyoxyethylene(10)glycol bi(Lauric acid),
polyoxyethylene(10)glycol bi(undecanedicarboxylic acid),
polyoxyethylene(10)glycol bi(Undecenoic acid).
7. The cleaning agent compound of claim 1 wherein said fatty
alcohol polyoxyethylene ether has the following formula:
RO--(CH.sub.2--CH.sub.2--O).sub.n--H wherein R is alkyl or ethenyl
having 8 to 14 carbon atoms and n is an integer between 5 and
15.
8. The cleaning agent compound of claim 7 wherein said R is
selected from the group consisting of nonyl-, decyl-, undecyl-,
dodecane-, nonenyl-, decenyl-, undecenyl-, dodecenyl-; and n is an
integer between 6 and 12.
9. The cleaning agent compound of claim 7 wherein said fatty
alcohol polyoxyethylene ether is selected from the group consisting
of polyoxyethylene (6) nonyl ether, polyoxyethylene (8) decyl
ether, polyoxyethylene (6) dodecane ether, polyoxyethylene (10)
dodecane ether, polyoxyethylene (6) undecenyl ether,
polyoxyethylene (11) dodecenyl ether.
10. The cleaning agent compound of claim 1 wherein said
polyethylene(3) glycol alkyl ether tri(alkyl ethers)amine sulfate
and/or polyethylene(3) glycol alkenyl ether tri(alkyl ethers)amine
sulfate have the following formula:
RO--(CH.sub.2--CH.sub.2--O).sub.3--SO.sub.3HNR'.sub.3 wherein R is
alkyl or ethenyl having 8 to 14 carbon atoms; and R' is alkyl
alcohol having 1 to 4 carbon atoms.
11. The cleaning agent compound of claim 10 wherein said R is
selected from the group consisting of decyl-, undecyl-, dodecane-,
tridecyl-, decenyl-, undecenyl-, dodecenyl-; and said R' is
selected from the group consisting of methanol, ethanol,
propanol.
12. The cleaning agent compound of claim 10 wherein said
polyethylene(3) glycol alkyl ether tri(alkyl ethers)amine sulfate
and/or polyethylene(3) glycol alkenyl ether tri(alkyl ethers)amine
sulfate is selected from the group consisting of polyethylene(3)
glycol undecyl ether tri(ethanol)amine sulfate, polyethylene(3)
glycol dodecane ether tri(ethanol)amine sulfate, polyethylene(3)
glycol tridecyl ether tri(ethanol)amine sulfatepolyethylene(3)
glycol dodecane ether tri(ethanol)amine sulfate, polyethylene(3)
glycol dodecane ether tri(methanol)amine sulfate, polyethylene(3)
glycol dodecane ether tri(propanol)amine sulfate, polyethylene(3)
glycol undecenyl ether tri(ethanol)amine sulfate, polyethylene(3)
glycol dodecenyl ether tri(methanol)amine sulfate, polyethylene(3)
glycol dodecenyl ether tri(propanol)amine sulfate.
13. The cleaning agent compound of claim 1 wherein said alkyl
benzenesulfonic acid has the following formula: ##STR00002##
wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 can be
different or identical alkyl having 6 to 15 hydrogen atoms or
carbon atoms.
14. The cleaning agent compound of claim 13 wherein said alkyl
benzenesulfonic acid is selected from the group consisting of
octyl-benzenesulfonic acid, nonyl-benzenesulfonic acid,
decyl-benzenesulfonic acid, undecyl-benzenesulfonic acid,
dodecylbenzenesulfonic acid, tridecyl-benzenesulfonic acid.
15. A method for fabricating said cleaning agent compound of claim
1 wherein said double fatty acid polyethylene glycol ester, fatty
alcohol polyoxyethylene ether, polyethylene(3) glycol alkyl ether
tri(alkyl ethers)amine sulfate and/or polyethylene(3) glycol
alkenyl ether tri(alkyl ethers)amine sulfate, alkyl benzenesulfonic
acid, lecithins and water are mixed together; the weight of said
double fatty acid polyethylene glycol ester is between 10-50 wt %
of the weight of said cleaning agent compound; the weight of said
fatty alcohol polyoxyethylene ether is between 5-60 wt % of the
weight of said cleaning agent compound; the weight of said
polyethylene(3) glycol alkyl ether tri(alkyl ethers)amine sulfate
and/or polyethylene(3) glycol alkenyl ether tri(alkyl ethers)amine
sulfate is between 5-20 wt % of the weight of said cleaning agent
compound; the weight of said alkyl benzenesulfonic acid is between
1-15 wt % of the weight of said cleaning agent compound; the weight
of said lecithins is between 1-10 wt % of the weight of said
cleaning agent compound; and the weight of said water is between
5-50 wt % of the weight of said cleaning agent compound.
16. The method for fabricating the cleaning agent compound of claim
15 wherein the weight of said double fatty acid polyethylene glycol
ester is between 10-40 wt % of the weight of said cleaning agent
compound; the weight of said fatty alcohol polyoxyethylene ether is
between 30-50 wt % of the weight of said cleaning agent compound;
the weight of said polyethylene(3) glycol alkyl ether tri(alkyl
ethers)amine sulfate and/or polyethylene(3) glycol alkenyl ether
tri(alkyl ethers)amine sulfate is between 5-15 wt % of the weight
of said cleaning agent compound; the weight of said alkyl
benzenesulfonic acid is between 5-15 wt % of the weight of said
cleaning agent compound; the weight of said lecithins is between
2-5 wt % of the weight of said cleaning agent compound; and the
weight of said water is between 10-20 wt % of the weight of said
cleaning agent compound.
17. The method for fabricating the cleaning agent compound of claim
15 wherein said double fatty acid polyethylene glycol ester is
selected from the group consisting of polyoxyethylene(10)glycol
bi(Lauric acid), polyoxyethylene(10)glycol bi(undecanedicarboxylic
acid), polyoxyethylene(10)glycol bi(Undecenoic acid).
18. The method for fabricating the cleaning agent compound of claim
15 wherein said fatty alcohol polyoxyethylene ether is selected
from the group consisting of polyoxyethylene (6) nonyl ether,
polyoxyethylene (8) decyl ether, polyoxyethylene (6) dodecane
ether, polyoxyethylene (10) dodecane ether, polyoxyethylene (6)
undecenyl ether, polyoxyethylene (11) dodecenyl ether.
19. The method for fabricating the cleaning agent compound of claim
15 wherein said polyethylene(3) glycol alkyl ether tri(alkyl
ethers)amine sulfate and/or polyethylene(3) glycol alkenyl ether
tri(alkyl ethers)amine sulfate is selected form the group
consisting of polyethylene(3) glycol undecyl ether
tri(ethanol)amine sulfate, polyethylene(3) glycol dodecane ether
tri(ethanol)amine sulfate, polyethylene(3) glycol tridecyl ether
tri(ethanol)amine sulfate, polyethylene(3) glycol dodecane ether
tri(methanol)amine sulfate, polyethylene(3) glycol dodecane ether
tri(propanol)amine sulfate, polyethylene(3) glycol undecenyl ether
tri(ethanol)amine sulfate, polyethylene(3) glycol dodecenyl ether
tri(methanol)amine sulfate, polyethylene(3) glycol dodecenyl ether
tri(propanol)amine sulfate.
20. The method for fabricating the cleaning agent compound of claim
15 wherein said alkyl benzenesulfonic acid is selected from the
group consisting of octyl-benzenesulfonic acid, nonylbenzene
sulfonic acid, acid decylbenzene sulfonic acid,
undecyl-benzenesulfonic acid, dodecylbenzenesulfonic acid and,
tridecyl-benzenesulfonic acid.
Description
CROSS REFERENCE
This application claims priority from a Chinese patent application
entitled "Aqueous Liquid Crystal Display Cleaning Agent Compounds
and Their Fabrication Methods" filed on Dec. 26, 2005, having a
Chinese Application No. 200510132751.X. This Chinese application is
incorporated here by reference.
FIELD OF INVENTION
This invention relates to liquid crystal display cleaning agent
compounds and their fabrication methods, and in particular, aqueous
liquid crystal display cleaning agent compounds and their
fabrication methods.
BACKGROUND
Liquid crystal displays (LCDs) have been widely used as various
displays because of their characteristics of low power consumption,
excellent picture quality and light weight. For example, LCDs have
been developed for computer monitors, televisions and mobile
phones.
In the LCD manufacturing process, two glass substrates having a 10
.mu.m gap between them are bonded to one another by a sealant. Then
the liquid crystal is injected into the space between the two
substrates. There are electrodes inside the two grass substrates.
The electrodes are made of transparent conductive membranes and
control the displays of characters and images. Applying controlling
electrical signals to the membranes can control the displays of the
characters and images.
During the manufacturing process of the LCDs, the sides where the
two glass substrates are bonded will inevitably have small gaps
with a few .mu.m in the width. When injecting the liquid crystal
material into the space between the two glass substrates, the
liquid crystal material can invade the gaps by the capillary tube
phenomenon. Since the contaminants in the atmosphere can dissolve
in the crystal liquid material in the gaps and the gaps are very
close to the positions where the controlling electrical signals are
applied to the transparent electrodes, as a result, there can be
insulation deterioration problems. Therefore, the crystal liquid
material in the gaps needs to be cleaned.
Since the gaps are very narrow and are normally fewer than 10 um in
width, the cleaning agents need to have highly effective cleaning
capabilities in order to remove the liquid crystal material in the
gaps. Among the most commonly used cleaning agents, organic
solvents having halogen, such as fluohydrocarbon,
1,1,2-trichloroethane, 1,1,2-trichloroethene, perchloroethene and
dichloromethane work relatively well. However, there are
significant restrictions on the use of organic solvents having
halogen since the restrictions on the use of the organic solvents
are an important part in the world environmental protection
policies.
With the demands for alternative cleaning agents, various new
cleaning agents that can substitute said organic solvents having
halogen have been developed, in particular, hydrocarbon solvents or
mixed compound of both hydrocarbon solvent and polyglycol ether.
For example, Patent JP10-25495 disclosed an effective cleaning
agent for the LCDs. Said cleaning agent comprises of 5-95 wt %
saturated hydrocarbon and/or saturated cycle having boiling points
between 60.degree. C. and 280.degree. C. (For example, n-Decane or
Cyclododecatriene-1,5,9), and 5-95 wt % ethylene glycol having the
chemical formula of R1-(O--C.sub.nH.sub.2n).sub.m--O--R2 (in
particular, R1 and R2 are H, alkyl oracyl-, the total number of
carbon atoms in R1 and R2 is 1 to 20, n is 2 or 3; m is an integer
between 1 and 3). (For example, vinyl ethylene glycol dimethyl
ether). However, said cleaning agent has relative weak cleaning
capabilities and high flammability.
Moreover, in the manufacturing process of the LCDs, a mother glass
is cut into small glass substrates and lots of powders are
generated in the cutting process. These powders can attach to the
surfaces of the electrode terminal so as to hamper the later
sealing process. Moreover, the surface foreign contaminants such as
glass powders normally attach to the surfaces of the LCDs by
inter-molecular force. But they can also strongly attach to the
surfaces of the LCDs using liquid crystal material as a binding
agent. As a result, the cleaning agent needs to have much higher
cleaning capabilities to remove the surface contaminants. For the
most commonly used cleaning agents for the glass powders, the
patents JP 5-271699, JP 7-305093 and JP 2001-181699 disclosed
cleaning agents that are alkaline cleaning agents. However, the
alkaline cleaning agents not only cause surfaces damages for the
LCDs, but also cannot effectively remove the glass powder attached
to the surfaces of the LCDs.
With the recent development in the high-density technology of the
LCDs, the gap between the two glass substrates is getting narrower.
Moreover, with the increasing demands for better throughput and
higher passing rate for the production, the cleaning agents need to
be able to clean the LCDs effectively in a very short time. The
cleaning agents need effectively clean not only the liquid crystal
material in the gaps near the bonding of the two glass substrates,
but also the foreign contaminants on the surfaces of the electrode
terminal. Furthermore, currently used STN liquid crystal material
comprises of aromatics with --CN as typical substituents; while the
TFT liquid crystal material comprises of aromatics with --CN as
typical substituents. Since these two liquid crystal materials have
substantial differences in the molecular structures and physical
properties, there are demands for versatile LCD cleaning agent
compounds suitable for diverse molecular structures and physical
properties.
Due to the limitations of the prior art, it is therefore desirable
to have novel LCD cleaning agents that can effectively remove not
only the liquid crystal material in the gaps between the sides of
the two glass substrates, but also the foreign contaminants
attached to the surfaces of the LCDs.
SUMMARY OF INVENTION
An object of this invention is to provide LCD cleaning agent
compounds that effectively remove both the crystal liquid materials
in the gaps between the two glass substrates and foreign
contaminate particles attached on the surfaces of the glass
substrates.
Another object of this invention is to provide the fabrication
methods for said LCD cleaning agent compounds.
Briefly, the present invention relates to new compositions for LCD
cleaning agent compounds. Said compounds are comprised of double
fatty acid polyethylene glycol ester, fatty alcohol polyoxyethylene
ether, polyethylene(3) glycol alkyl ether tri(alkyl ethers)amine
sulfate and/or polyethylene(3) glycol enyl ether tri(alkyl
ethers)amine sulfate, alkyl benzenesulfonic acid, lecithins and
water. In particular, the weight of the ingredients in the
compounds as a weight percentage of the weight of the compound is:
double fatty acid polyethylene glycol ester (10-50 wt %), fatty
alcohol polyoxyethylene ether (5-60 wt %), polyethylene(3) glycol
alkyl ether tri(alkyl ethers)amine sulfate and/or polyethylene(3)
glycol enyl ether tri(alkyl ethers)amine sulfate (5-20 wt %), alkyl
benzenesulfonic acid (1-15 wt %), lecithins (1-10wt %), water (5-50
wt %).
An advantage of this invention is that the LCD cleaning agent
compounds have the characteristics of low toxicity, environmental
friendliness, low flammability and high cleaning capabilities for
various crystal liquid materials.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Embodiments of cleaning agent compounds for the LCDs of the present
invention may be comprised of double fatty acid polyethylene glycol
ester, fatty alcohol polyoxyethylene ether, polyethylene(3) glycol
alkyl ether tri(alkyl ethers)amine sulfate and/or polyethylene(3)
glycol enyl ether tri(alkyl ethers)amine sulfate, alkyl
benzenesulfonic acid, lecithins and water. In particular, the
weight of the ingredients in the compound as a weight percentage of
the compound is: double fatty acid polyethylene glycol ester (10-50
wt %), fatty alcohol polyoxyethylene ether (5-60 wt %),
polyethylene(3) glycol alkyl ether tri(alkyl ethers)amine sulfate
and/or polyethylene(3) glycol enyl ether tri(alkyl ethers)amine
sulfate (5-20 wt %), alkyl benzenesulfonic acid (1-15 wt %),
lecithins(1-10 wt %), water (5-50 wt %).
The methods of fabricating the embodiments of LCD cleaning agent
compounds include mixing double fatty acid polyethylene glycol
ester, fatty alcohol polyoxyethylene ether, polyethylene(3) glycol
alkyl ether tri(alkyl ethers)amine sulfate and/or polyethylene(3)
glycol enyl ether tri(alkyl ethers)amine sulfate, alkyl
benzenesulfonic acid, lecithins and water thoroughly. In
particular, the weight of the ingredients in the compounds as a
weight percentage of the compounds is: double fatty acid
polyethylene glycol ester (10-50 wt %), fatty alcohol
polyoxyethylene ether (5-60 wt %), polyethylene(3) glycol alkyl
ether tri(alkyl ethers)amine sulfate and/or polyethylene(3) glycol
enyl ether tri(alkyl ethers)amine sulfate (5-20 wt %), alkyl
benzenesulfonic acid (1-15 wt %), lecithins(1-10 wt %), water (5-50
wt %).
Said double fatty acid polyethylene glycol ester has cleaning and
viscosity increasing properties and its chemical formula is shown
here:
R.sub.1COO--(CH.sub.2--CH.sub.2--O--CH.sub.2--CH.sub.2--O).sub.n--OC--R.s-
ub.2
In the formula, R1 and R2 are either alkyl or ethenyl having 3 to
15 carbon atoms, preferably 5 to 13 carbon atoms. Said R1 and R2
can be different or identical, preferably identical. Said R1 and R2
can be selected from, but not limited to, the following: pentyl-,
hexyl-, hepty-, octyl-, nonyl-, decyl-, undecyl-, dodecane-,
tridecyl-, pentenyl-, Hexenyl-, heptenyl-, octenyl-, nonenyl-,
decenyl-, undecenyl-, dodecenyl-; n is an integer between 3 and 15,
preferably between 5 and 12. Said alkylcan be either straight-chain
hydrocarbon or branched-chain hydrocarbon. Moreover, the structure
of said alkyl and the position of double bond in said ethenyl do
not affect the functions of this chemical in the present
invention.
Said double fatty acid polyethylene glycol ester can be preferably
selected from at least one from the following:
polyoxyethylene(10)glycol bi(Lauric acid), polyoxyethylene(
10)glycol bi(undecanedicarboxylic acid), polyoxyethylene( 10)glycol
bi(Undecenoic acid).
The weight of said double fatty acid polyethylene glycol ester is
preferably between 10 wt % and 40 wt % of the total weight of the
LCD cleaning agent compound.
Said ether fatty alcohol polyoxyethylene ether has cleaning and
emulsification properties. It is chemical formula is shown below:
RO--(CH.sub.2--CH.sub.2--O).sub.N--H
In the formula, said R can be either alkyl or ethenyl having 8 to
14 carbon atoms, preferably 9 to 12 carbon atoms. Said R can be one
from the following: nonyl-, decyl-, undecyl-, dodecane-, nonenyl-,
decenyl-, undecenyl-, dodecenyl-; n is an integer between 5 and 15,
preferably between 6 and 12. Said alkyl can be either
straight-chain hydrocarbon or branched-chain hydrocarbon. Moreover,
the structure of said alkyl and the position of double bond of said
ethenyl do not affect the functions of this chemical in the present
invention.
Said fatty alcohol polyoxyethylene ether is preferably at least one
from the following: polyoxyethylene (6) nonyl ether,
polyoxyethylene (8) decyl ether, polyoxyethylene (6) dodecane
ether, polyoxyethylene (10) dodecane ether, polyoxyethylene (6)
undecenyl ether, polyoxyethylene (11) dodecenyl ether.
The weight of said fatty alcohol polyoxyethylene ether is
preferably between 30 wt % and 50 wt % of the total weight of the
LCD cleaning agent compound.
Said polyethylene(3) glycol alkyl ether tri(alkyl ethers)amine
sulfate and/or polyethylene(3) glycol enyl ether tri(alkyl
ethers)amine sulfate have diffusion and volume increasing
properties. It is chemical formula is shown below:
RO--(CH.sub.2--CH.sub.2--O).sub.3--SO.sub.3HNR'.sub.3
In the formula, said R is either alkyl or ethenyl having 8 to 14
carbon atoms, preferably 10 to 13 carbon atoms. Said R can be one
of the following: decyl-, undecyl-, dodecane-, tridecyl-, decenyl-,
undecenyl- and dodecenyl-. Said R' can be alkyl alcohol having 1 to
4 carbon atoms, preferably 1 to 3 carbon atoms. Said R' can be one
of the following: methanol, ethanol or propanol. Said alkylcan be
straight-chain hydrocarbon or branched-chain hydrocarbon. Moreover,
the structure of said alkyl and the position of the double bond in
said ethenyl do not affect the functions of this chemical in the
present invention.
Said polyethylene(3) glycol alkyl ether tri(alkyl ethers)amine
sulfate and/or polyethylene(3) glycol enyl ether tri(alkyl ethers)
amine sulfate is preferably at least one from the following:
polyethylene(3) glycol undecyl ether tri(ethanol)amine sulfate,
polyethylene(3) glycol dodecane ether tri(ethanol)amine sulfate,
polyethylene(3) glycol tridecyl ether tri(ethanol)amine sulfate,
polyethylene(3) glycol dodecane ether tri(methanol)amine sulfate,
polyethylene(3) glycol dodecane ether tri(propanol)amine sulfate,
polyethylene(3) glycol undecenyl ether tri(ethanol)amine sulfate,
polyethylene(3) glycol dodecenyl ether tri(methanol)amine sulfate,
polyethylene(3) glycol dodecenyl ether tri(propanol)amine
sulfate.
The weight of said polyethylene(3) glycol alkyl ether tri(alkyl
ethers)amine sulfate and/or polyethylene(3) glycol enyl ether
tri(alkyl ethers)amine sulfate is preferably between 5-15 wt % of
the total weight of the LCD cleaning agent compound.
Said alkyl benzenesulfonic acid has cleaning and permeation
properties. It is chemical formula is shown below:
##STR00001##
In the above formula, said R1-R6 can be identical or different.
R1-R6 can be either hydrogen or alkyl. Said alkyl has 6-15 carbon
atoms, preferably 8-13.
Said alkyl benzenesulfonic acid is preferably selected at least one
from the following: octyl-benzenesulfonic acid,
nonyl--benzenesulfonic acid, decyl--benzenesulfonic acid,
undecyl-benzenesulfonic acid, dodecylbenzenesulfonic acid, or
tridecyl-benzenesulfonic acid. The position of the alkyl in said
alkyl benzenesulfonic acid can be o-, p- or m- to the sulfonic
acid, preferably o-. Moreover, the position and the structure of
said alkyl do not affect the functions of this chemical in the
present invention.
The weight of said alkyl benzenesulfonic acid is preferably between
5 wt % and 15 wt % of the total weight of the LCD cleaning agent
compound.
Said lecithins have anti-oxidation and diffusion properties. The
weight of said lecithins is preferably between 2 wt % and 5 wt % of
the total weight of the LCD cleaning agent compound.
The weight of said water is preferably between 10 wt % and 20 wt %
of the total weight of the LCD cleaning agent compound.
The present invention provides methods of fabrication for the LCD
cleaning agent compound. The methods include mixing double fatty
acid polyethylene glycol ester, fatty alcohol polyoxyethylene
ether, polyethylene(3) glycol alkyl ether tri(alkyl ethers)amine
sulfate and/or polyethylene(3) glycol enyl ether tri(alkyl
ethers)amine sulfate, alkyl benzenesulfonic acid, lecithins and
water together. The weight of each ingredient in the compound as
the percentage weight of the total weight of the compound is:
double fatty acid polyethylene glycol ester (preferably 10-40 wt
%), fatty alcohol ether fatty alcohol polyoxyethylene ether
(preferably 30-50 wt %), polyethylene(3) glycol alkyl ether
tri(alkyl ethers)amine sulfate and/or polyethylene(3) glycol enyl
ether tri(alkyl ethers)amine sulfate (preferably 5-15 wt %), alkyl
benzenesulfonic acid (preferably 5-15 wt %), lecithins (preferably
2-5 wt %) and water (preferably 10-20 wt %). The mixing of the
ingredients is preferably performed at room temperature and by
stirring.
The present invention also provides methods of cleaning for LCDs.
The methods comprise of the following steps:
soaking the liquid crystal cells in the cleaning agent compound
solution with said cells being completely submerged in said
solution;
soaking temperature is between 30.degree. C. and 80.degree. C., the
soaking time is between 5 and 45 minutes. Preferably, the soaking
is performed along with ultrasound wave, the soaking temperature is
between 45.degree. C. and 65.degree. C. and the soaking time is
between 10 and 35 minutes;
removing said cells out of the cleaning agent compound
solution;
washing said cells with 0.1-5 wt % alkaline solution such as
potassium hydroxide or sodium hydroxide;
washing said cells with distilled water; and
drying said cells and the drying conditions and methods are well
known to ordinary person skilled in the art.
The following embodiments further describe this invention.
Embodiment 1
This embodiment describes the cleaning of liquid crystal cells with
a cleaning agent compound that is an embodiment of the present
invention.
The fabrication of the cleaning agent compound comprises of the
following steps:
mixing polyoxyethylene(10)glycol bi(Lauric acid), polyoxyethylene
(6) n-dodecane ether, polyoxyethylene (10) n-dodecane ether,
polyethylene(3) glycol n-dodecane ether tri(ethanol)amine sulfate,
p-octyl-benzenesulfonic acid, lecithins and deionized water at a
weight ratio of 25:40:5:10:8:2:10;
mixing the ingredients above thoroughly to obtain the cleaning
agent compound solution A1;
heating said cleaning agent compound solution to 50.degree. C.;
soaking 50 liquid crystal cells (BYD Inc., Model Number 280A) in
the cleaning agent compound solution;
shaking said solution and washing said cells with ultrasound wave
for 20 minutes;
taking the liquid crystal cells out of the cleaning agent
solution;
washing said cells with 1 wt % potassium hydroxide solution and
distilled water respectively; and
drying said cells at 100.degree. C. for two hours.
Embodiment 2
This embodiment describes the cleaning of liquid crystal cells with
a cleaning agent compound that is an embodiment of the present
invention.
The fabrication of the cleaning agent compound comprises of the
following steps:
mixing polyoxyethylene(10)glycol bi(Lauric acid), polyoxyethylene
(8) n-decyl ether, polyoxyethylene (6) n-nonyl ether,
11-polyoxyethylene (11) dodecenyl ether, polyethylene(3) glycol
n-tridecyl ether tri(ethanol)amine sulfate,
o-dodecylbenzenesulfonic acid, p-octyl-benzenesulfonic acid,
lecithins and deionized water at a weight ratio of
15:30:5:5:10:5:5:5:20;
mixing the ingredients thoroughly to obtain the cleaning agent
compound solution A2;
heating said cleaning agent compound to 50.degree. C.;
soaking 50 liquid crystal cells (BYD Inc., Model Number 280A) into
the cleaning agent compound solution;
shaking said solution and washing said cells with ultrasound wave
for 10 minutes;
taking the liquid crystal cells out of the cleaning agent
solution;
washing said cells with 1 wt % potassium hydroxide solution and
distilled water respectively; and
drying said cells at 100.degree. C. for two hours.
Embodiment 3
This embodiment describes the cleaning of liquid crystal cells with
a cleaning agent compound that is an embodiment of the present
invention.
The fabrication of the cleaning agent compound comprises of the
following steps:
mixing polyoxyethylene(10)glycol bi(Lauric acid), polyoxyethylene
(8) n-decyl ether, polyoxyethylene (6) n-nonyl ether,
11-polyoxyethylene (11) dodecenyl ether, polyethylene(3) glycol
n-tridecyl ether tri(ethanol)amine sulfate,
o-dodecylbenzenesulfonic acid, p-octyl-benzenesulfonic acid,
lecithins and deionized water at a weight ratio of
15:30:5:5:10:5:5:5:20;
mixing the ingredients thoroughly to obtain the cleaning agent
compound solution A3;
heating said cleaning agent compound solution to 55.degree. C.;
soaking 50 liquid crystal cells (BYD Inc., Model Number 280A) in
the cleaning agent compound solution;
shaking said solution and washing said cells with ultrasound wave
for 15 minutes;
taking the liquid crystal cells out of the cleaning agent
solution;
washing said cells with 1 wt % potassium hydroxide solution and
distilled water respectively; and
drying said cells at 100.degree. C. for two hours.
Embodiment 4
This embodiment describes the cleaning of liquid crystal cells with
a cleaning agent compound that is an embodiment of the present
invention.
The fabrication of the cleaning agent compound comprises of the
following steps:
mixing polyoxyethylene(10)glycol bi(Lauric acid),
polyoxyethylene(10)glycol bi(n-tridecyl acid), polyoxyethylene (6)
n-dodecane ether, polyethylene(3) glycol n-dodecane ether
tri(methanol)amine sulfate, o-undecyl-benzenesulfonic acid,
lecithins and deionized water at a weight ratio of
25:10:40:5:5:5:10;
mixing the ingredients thoroughly to obtain the cleaning agent
compound solution A4;
heating said cleaning agent compound solution to 50.degree. C.;
soaking 50 liquid crystal cells (BYD Inc., Model Number 280A) in
the cleaning agent compound solution;
shaking said solution and washing said cells with ultrasound wave
for 25 minutes;
taking the liquid crystal cells out of the cleaning agent
solution;
washing said cells with 1 wt % potassium hydroxide solution and
distilled water respectively; and
drying said cells at 100.degree. C. for two hours.
Embodiment 5
This embodiment describes the cleaning of liquid crystal cells with
a cleaning agent compound that is an embodiment of the present
invention.
The fabrication of the cleaning agent compound comprises of the
following steps:
mixing polyoxyethylene(10)glycol bi(n-undecyl acid),
polyoxyethylene (6) n-dodecane ether, polyethylene(3) glycol
n-dodecane ether tri(propanol)amine sulfate,
o-octyl-benzenesulfonic acid, lecithins and deionized water at a
weight ratio of 15:35:15:15:5:15;
mixing the ingredients thoroughly to obtain the cleaning agent
compound A5;
heating said cleaning agent compound solution to 45.degree. C.;
soaking 50 liquid crystal cells (BYD Inc., Model Number 280A) in
the cleaning agent compound solution;
shaking said solution and washing said cells with ultrasound wave
for 10 minutes;
taking the liquid crystal cells out of the cleaning agent
solution;
washing said cells with 1 wt % potassium hydroxide solution and
distilled water respectively; and
drying said cells at 100.degree. C. for two hours.
Embodiment 6
This embodiment describes the cleaning of liquid crystal cells with
a cleaning agent compound that is an embodiment of the present
invention.
The fabrication of the cleaning agent compound comprises of the
following steps:
mixing polyoxyethylene(10)glycol bi(Lauric acid), polyoxyethylene
(8) n-decyl ether, 10-polyethylene(3) glycol dodecenyl ether
tri(propanol)amine sulfate, polyethylene(3) glycol dodecenyl ether
tri(ethanol)amine sulfate, o-undecyl-benzenesulfonic acid,
lecithins and deionized water at a weight ratio of
38:30:5:2:7:3:15;
mixing the ingredients thoroughly by stirring to obtain the
cleaning agent compound solution A6;
heating said cleaning agent compound to 50.degree. C.;
soaking 50 liquid crystal cells (BYD Inc., Model Number 280A) in
the cleaning agent compound solution;
shaking said solution and washing said cells with ultrasound wave
for 10 minutes;
taking the liquid crystal cells out of the cleaning agent
solution;
washing said cells with 1 wt % potassium hydroxide solution and
distilled water respectively; and
drying said cells at 100.degree. C. for two hours.
Embodiment 7
This embodiment describes the cleaning of liquid crystal cells with
a cleaning agent compound that is an embodiment of the present
invention.
The fabrication of the cleaning agent compound comprises of the
following steps:
mixing polyoxyethylene(10)glycol bi(undecenyl acid),
9-polyoxyethylene (6) undecenyl ether, polyethylene(3) glycol
n-dodecane ether tri(ethanol)amine sulfate, o-octyl-benzenesulfonic
acid, lecithins, and deionized water at a weight ratio of
12:50:12:8:4:14;
mixing the ingredients thoroughly by stirring to obtain the
cleaning agent compound solution A7;
heating said cleaning agent compound to 60.degree. C.;
soaking 50 liquid crystal cells (BYD, Inc., Model Number 280A) in
said cleaning agent compound solution A7;
shaking said solution and washing said cells with ultrasound wave
for 10 minutes;
taking the liquid crystal cells out of the cleaning agent
solution;
washing said cells with 1 wt % potassium hydroxide solution and
distilled water respectively; and
drying said cells at 100.degree. C. for two hours.
COMPARISON EXAMPLE 1
This comparison example describes the cleaning of the liquid
crystal cells using traditional cleaning agent compounds.
The liquid crystal cells are cleaned under the identical methods as
in Embodiment 1. The only difference is that a cleaning agent with
model number CFC113 is used. The cleaning agent is labeled as B1
here.
Embodiments 8-14
These embodiments describe the cleaning rate test for the liquid
crystal cells cleaned with the cleaning agents A1-A7 fabricated in
the Embodiments 1-7, respectively.
Said cleaning rate is the passing rate for the cleaned liquid
crystal cells. The cleaning rate test is performed as described
here. After cleaning, the glass substrates of the cleaned liquid
crystal cells are observed under microscope. If there are neither
crystal material leftovers nor foreign contaminants on the surfaces
of the liquid crystal box, then the liquid crystal box is a
qualified product. The cleaning rate can be calculated according to
the following formula: cleaning rate=(The number of qualified
products/The total number of the liquid crystal cells
cleaned).times.100%. The results are shown in Table 1.
COMPARISON EXAMPLE 2
The cleaning rate test is performed as described in Embodiments
8-14. The only difference is that the cleaning agent in Comparison
Example 1 is used. The results are shown in Table 1.
TABLE-US-00001 TABLE 1 Embodiment No. Cleaning Agent No. Cleaning
Rate Embodiment 8 A1 98% Embodiment 9 A2 94% Embodiment 10 A3 95%
Embodiment 11 A4 95% Embodiment 12 A5 94% Embodiment 13 A6 96%
Embodiment 14 A7 93% Comparison Example 2 B1 90%
Table 1 shows that the aqueous cleaning agent compounds that are
embodiments of the present invention have distinctly improved
cleaning properties over the traditional LCD cleaning agent
compounds. As shown in Table 1, the cleaning rate for the liquid
crystal cells cleaned with the traditional cleaning agent with
model number CFC113 is only about 90% while the cleaning rate for
the cells cleaned with the cleaning agent A1 that is an embodiment
of the present invention is 98%.
While the present invention has been described with reference to
certain preferred embodiments, it is to be understood that the
present invention is not limited to such specific embodiments.
Rather, it is the inventor's contention that the invention be
understood and construed in its broadest meaning as reflected by
the following claims. Thus, these claims are to be understood as
incorporating not only the preferred embodiments described herein
but also all those other and further alterations and modifications
as would be apparent to those of ordinary skilled in the art.
* * * * *